Figure 4
From: Optically reconfigurable polarized emission in Germanium
Polarization-resolved energy spectrum of Ge. (a) Low-temperature direct gap PL of Ge under 1.2 kW/cm2 excitation power density (upper panel). Color-coded map of the PL intensity describing the modulation of the direct-gap PL as a function of the analyser angle (lower panel). ΔE corresponds to the emission energy shifted with respect to the spectral position of the PL peak. (b) Modulation of the PL peak intensity as a function of the angle of the polarization analyser. The data are spectrally resolved for photons emitted at the PL peak (cyan curve), at a positive (red curve) and at negative (violet curve) energy detuning ΔE. (c) Qualitative representation on the Poincaré sphere of the polarized component of the PL corresponding to the ΔE values shown in b.
